GB645121A - Improvements in and relating to self-pulsing oscillators - Google Patents

Improvements in and relating to self-pulsing oscillators

Info

Publication number
GB645121A
GB645121A GB17513/45A GB1751345A GB645121A GB 645121 A GB645121 A GB 645121A GB 17513/45 A GB17513/45 A GB 17513/45A GB 1751345 A GB1751345 A GB 1751345A GB 645121 A GB645121 A GB 645121A
Authority
GB
United Kingdom
Prior art keywords
voltage
pulse
grid
circuit
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB17513/45A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB645121A publication Critical patent/GB645121A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/78—Generating a single train of pulses having a predetermined pattern, e.g. a predetermined number
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
    • H03K3/16—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using a transformer for feedback, e.g. blocking oscillator with saturable core

Abstract

645,121. Valve keying and generating circuits. BRITISH THOMSON-HOUSTON CO., Ltd. July 9, 1945, No. 17513. Convention date, Feb. 19, 1943. [Classes 40 (v) and 40 (vi)] An oscillator comprises an electronic valve with an oscillatory circuit connected in part between anode and cathode, and in part between grid and cathode, and also a pulse generating circuit comprising a second anodecathode circuit which is transformer-coupled to a second grid-cathode circuit. The oscillator section consists of a Hartley circuit comprising valve 10, coils 14, 16, and condenser 18; condensers 17 are byepass condensers which prevent radio frequency oscillations penetrating the pulse generating network. The pulse generating network, which is independent of the oscillator section, consists of valve 10, transformer 20, delay line 26 and resistance 27. In operation, the primary 21 of transformer 20 is fed from the anode potential through condenser 23 which has negligible impedance at pulse frequency, so that as anode current rises, the secondary 22 of transformer 20 produces a positive voltage on the control electrode 13, thus accelerating the change and initiating the pulse. The total resistance of resistance 27 and the grid cathode resistance may be made equal to the surge impedance of the line, so that the voltage across the line is approximately half that developed across the secondary coil 22. This voltage, after travelling down the line and being reflected from the far end, produces a voltage across the line equal to the total voltage across the coil, thus effectively reducing the potential of the grid to zero after a time delay determined by the delay line. This condition causes regenerative action which effectively biasses the valve below cut-off. The resulting charge on condensers 28 in the delay line leaks away at a rate determined by variable resistance 30, after which the circuit is ready for the next synchronizing pulse which is applied to a third winding 25 in transformer 20. To ensure that the anode voltage during the pulse is sufficient to operate the oscillator section, a voltage limiting device 31 is connected across the primary coil 21, and to prevent excessive grid current during the pulse, a voltage limiting device 32 is connected between the grid and cathode.
GB17513/45A 1943-02-19 1945-07-09 Improvements in and relating to self-pulsing oscillators Expired GB645121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US476371A US2417834A (en) 1943-02-19 1943-02-19 Self-pulsing oscillator

Publications (1)

Publication Number Publication Date
GB645121A true GB645121A (en) 1950-10-25

Family

ID=23891571

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17513/45A Expired GB645121A (en) 1943-02-19 1945-07-09 Improvements in and relating to self-pulsing oscillators

Country Status (3)

Country Link
US (1) US2417834A (en)
BE (2) BE481918A (en)
GB (1) GB645121A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2627030A (en) * 1943-08-03 1953-01-27 Arthur A Varela Impulse generator
US2432227A (en) * 1943-08-24 1947-12-09 Westinghouse Electric Corp Pulsed oscillator
US2447082A (en) * 1944-06-29 1948-08-17 Rca Corp Generator circuit
US2672558A (en) * 1945-06-28 1954-03-16 Fischman Martin Pulse generator
US2638548A (en) * 1945-09-18 1953-05-12 Us Navy Gated oscillator circuit
US2564045A (en) * 1946-01-07 1951-08-14 David F Winter Modulator
US2578273A (en) * 1946-02-27 1951-12-11 George P Wachtell Electronic time delay device
FR955774A (en) * 1946-09-16 1950-01-19
US3030502A (en) * 1947-03-14 1962-04-17 Otto H Schmitt Automatic radio spectrum monitor
US2750509A (en) * 1952-01-16 1956-06-12 Rca Corp Pulse generators
US2750510A (en) * 1952-01-16 1956-06-12 Rca Corp Free-running square wave generator
US2975376A (en) * 1958-04-30 1961-03-14 Robert H Dicke Stable oscillator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1531633A (en) * 1920-12-22 1925-03-31 Western Electric Co Oscillation generator
DE541087C (en) * 1928-10-13 1932-01-06 Verwertung Der Theremin Patent Double grid tube interference generator
US2024138A (en) * 1930-10-21 1935-12-17 Edwin H Armstrong Radio signaling system
US2213398A (en) * 1938-07-22 1940-09-03 Bell Telephone Labor Inc Vacuum tube circuit
US2257663A (en) * 1939-06-01 1941-09-30 American Telephone & Telegraph Apparatus for producing interrupted alternating current
US2300429A (en) * 1941-11-19 1942-11-03 Bell Telephone Labor Inc Protective circuit for oscillators

Also Published As

Publication number Publication date
BE481918A (en)
BE480551A (en)
US2417834A (en) 1947-03-25

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